Combined widening and guiding tool for boring wells



Jan. 8, 1935. GLiWlTZKl I 1,987,291

COMBINED WIDENING AND GUIDING TOOL FOR BORING WELLS Filed Feb. 20, 1952INVENTOR I ATTORNEY Patented Jan. 8, 1935 UNITE STATES PATENT OFFICECOMBINED W'IDENING AND GUIDING TOOL FOR BORING WELLS 1 Claim.

This invention refers to an improved tool comprising a Widener and guideto be used in the boring of wells and which is illustrated in theaccompanying drawing, wherein:

Fig. 1 is an elevation of a tool constructed according to my inventionfor use with rotary drills.

Fig. 2 is an end view thereof.

Fig. 3 shows a modified form of drill.

' Fig. 4 is an end view thereof.

Fig. 5 shows another modification of my invention.

Fig. 6 is an end view thereof.

Fig. '7 shows a further modified form of drill.

Fig. 8 is an end view thereof.

Fig. 9 shows a still further modification of the tool.

Fig. 10 is an end view thereof.

This improved boring tool comprises a threaded body (1) provided withvarious blades or fins (2) adaptable for the widening of the diameter ofthe well and maintaining in perfect working position the whole of theboring outfit. The material to be used in the manufacture of theinvention, is that which is usually employed in the construction ofboring tools, although alloys of a hard and resistant metal may also beadded to the parts exposed to friction with the ground to be drilled.Thethreads(3) whichserve to unite the tool object of this invention tothe remaining boring tools may be made in accordance with the experiencegained by practical tests with the dilferent systems.

The improved combined tool may be applied directly to the upper part ofthe boring instrument (drill or crown) or separated from same by meansof reductions, master bars or boring pipes. One or more of thesecombined tools may be used at one time, excepting cases where excentricboring is being carried out, in which case only one of these tools is tobe used. The fins or blades of the combined tool serve to rectify thesection of the well, excavating the earth which has not been touched bythe drill or crown due to these having been slightly worn by frictionduring the perforation. This avoids frequent replacing of the drills andeliminates the necessity of reboring the well with a drill, crossmouthed borer or Widener. Due to the position of the various blades orfins and specially when several of these combined tools are used atonce, the whole of the tools are maintained in working position, whichalso guarantees a vertical perforation with rotary systems, where up tothe present day, the instrument which only operates at the bottom, forvarious reasons, and sometimes due to the twisting or decentralizationof the bars was easily deviated from operating in a vertical direction.

It is evident that the setting of a pipe in a well vertically drilledand of an even diameter does not afford any dilficulty in the carryingout of the operation.

In the systems where perforations are being carried out by means ofcables, an additional advantage is obtained by diminishing the danger ofthe tools being damaged or broken.

Up to the present day when using this system the master bar remainssuspended without any guide and as the drill tool hits the bottom of thewell, the master bar is violently bended and therefore causes thebreakage of the union threads. The lower portion generally remainsinclined also and hinders the fishing operation, as when this is beingcarried out the inclination increases and causes the upper extremity ofthe lost portion to enter the walls of the well, thus making the fishingoperation an impossibility. When the combined tool, object of thisinvention is employed, the lateral movement of the master bar is avoidedby the guiding action of the blades or fins and this prevents anybreakages. Furthermore in the case of fishing operations, the upper endof the lost portion is maintained in the center of the well. i

This combined tool is also adaptable for the carrying out of the socalled eccentric perforations, if the blades are disposed inasymmetrical position as shown in Fig. 3, of rotary systems as shown inFig. 4 (for percussion systems). In this case it is only possible toemploy a combined tool, because by placing several, these would notmaintain exactly the same eccentrical position in relation to eachother, and it would not be possible to pass the whole outfit through thepipes.

In perforations made by the crown system, three combined tools areapplied at one time, viz:

- one on top of the crown, one in the middle of the boring pipe (orbetween two boring pipes) and the third on top of the last boring pipe.The advantage obtained would be identical to those obtained inperforations done with the drill tool.

It is evident that modifications may be eifected in the construction anddetails of the invention without departing from the scope of same.

Having thus described the nature of my invention and the manner in whichsame may be put into practice, what I claim as new and wish to protectby Letters Patent, is:

In a well boring tool, an elongated central body having an upper offsetand threaded end, and a lower threaded central bore for coupling thetool to the line of drill pipe and to other tools, and a plurality offins or blades outwardly extending from said central body symmetricallyand asymmetrically arranged thereto, one of said fins or bladessubdivided into a plurality of blades and projecting from said centralbody for a longer distance than the others, said blades having bevelledouter edges.

GUILLERMO GLIWITZKI.

